Robotics is the branch of technology that deals with the design, construction, operation, manufacture and application of robots. It is a field of research which is related to the study of electronics, mechanics and software. Robotics is derived from the word “robot” which is basically a mechanical or virtual intelligent agent which can perform tasks on its own, or with guidance. It is man’s attempt to imitate or copy nature.
A robot is a system or a device that contains sensors, control systems, power supplies and software all working together to perform a particular task. Designing, building, programming and testing a robot is a combination of physics, mechanical engineering, electrical engineering, mathematics and computing. Sometimes biology, medicine and chemistry might also be involved. A study of robotics means being actively engaged with all of these disciplines in a deep problem-posing and problem-solving environment.
A robot is a device, which may or may not have an artificial brain of its own, which is built mainly to make man’s life simpler and safer. It helps make work easier, completes work faster, provides greater accuracy and most importantly helps decrease the threat to life and health.
A Talon explosive ordnance disposal (EOD) robot is used to disarm an improvised explosive device during a Navy demonstration at Fort Story, Virginia.
Some examples of famous robots:
Shakey, the robot
Shakey was developed (1966–72) at the Stanford Research Institute, Menlo Park, California. The robot is equipped with of a television camera, a range finder, and collision sensors that enable a minicomputer to control its actions remotely. Shakey can perform a few basic actions, such as go forward, turn, and push, albeit at a very slow pace. Contrasting colours, particularly the dark baseboard on each wall, help the robot to distinguish separate surfaces.
The Octopus ArmMarvin Minsky, in 1968, developed the Tentacle Arm, which moved like an octopus. It had twelve joints designed to reach around obstacles.
AIBO (Artificial Intelligence robot)
It was one of several types of robotic pets designed and manufactured by Sony. AIBO is able to walk, "see" its environment via camera and recognize spoken commands in Spanish and English. AIBO robotic pets are considered to be autonomous robots since they are able to learn and mature based on external stimuli from their owner, their environment and from other AIBOs. 
Qiro By Sony
AsimoBy Honda
Qiro and Asimo both are examples of humanoid robots.
Robotics is a big field and what I am going to be writing about is how you can create your very own robot, that too right from scratch!
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